[Springboot] 40. OAuth 2.0 (2단계-Kakao Developers API 응답 코드 받기) @GetMapping("/kakao") public String getDataByKakao(@RequestParam("code")String code){ System.out.println("---------------"); System.out.println(code); System.out.println("---------------"); return new String(); } @GetMapping("/kakao") @ResponseBody // @RestController = @Controller + @ResponseBody public String getMethodNa..